operates several bases in the state – Sheppard (Wichita Falls), Dyess (Abilene), Goodfellow (San Angelo), Laughlin (Del Rio), and Lackland and Randolph (San Antonio) Ellington Airport, (Houston). The United States Navy operates Naval Air Station Joint Reserve Base Fort Worth (the former Carswell Air Force Base facility) as well as NAS Corpus Christi and NAS Kingsville. Defense contracting Texas (specifically Dallas and Houston) has a large number of defense contractors which creates sizable employment for the state. Two divisions of Lockheed Martin have their divisional headquarters in the DFW area – Lockheed Martin Aeronautics in Fort Worth (where the F-16 Fighting Falcon, the largest Western fighter program, is manufactured, as well as its successor, the F-35 Lightning II and the F-22 Raptor) and Lockheed Martin Missiles and Fire Control in Grand Prairie. Fort Worth is also the home of Bell Helicopter Textron, which manufactures several helicopters for the military, including the V-22 and the H-1, on which final assembly is performed in Amarillo. Furthermore, three major defense service contractors (DynCorp, AECOM, and DXC Technology) have substantial operations in Fort Worth. Other major defense contractors with DFW presence include Boeing (Richardson), Rockwell Collins (Richardson), Vought Corporation (headquarters in Dallas; facilities in Dallas and Grand Prairie), Raytheon (plants in Garland, Dallas, and McKinney), L-3 Communications (plants in Arlington, Carrollton, and Greenville; also has a facility in Waco), BAE Systems (facility in Fort Worth), Leonardo DRS (Dallas), Hewlett Packard Enterprise and NTT Data (Plano), Alliant Techsystems (facility in Fort Worth), and Elbit Systems (facility and US headquarters in Fort Worth). The Defense Contract Audit Agency maintains its Central Region office in Irving. Outside the DFW area, KBR (the former Halliburton subsidiary) maintains its headquarters in Houston, while the Southwest Research Institute is located in San Antonio. BAE Systems also manufactures the Family of Medium Tactical Vehicles at its facility in Sealy, Texas. Computer technology Texas is one of the major hubs in the U.S. for development of computer components, systems, software and information infrastructure. Austin, Dallas, and Houston are the major centers for this industry in Texas. The Austin area is often nicknamed "Silicon Hills" because of the concentration of semiconductor design companies including AMD, Cirrus Logic, Freescale Semiconductor, Intel and Silicon Labs. Dell's headquarters is located in the city's suburb, Round Rock, and major offices for Google, Facebook, EA Games, and Apple are also open in the Austin area. Austin is also